Process of rolling in recesses in blanks.



J. HELLER.

PROCESS OFROLLiNG-IN REGESSES IN BLANKS.

APPLICATION FILED MAR. s, 1909.

967,768. Patented Aug. 16,1910.

4 BHEETB-SHEET 1.

J. HELLER.

PROCESS OF ROLLING-IN REGESSES IN BLANKS.

Patented Aug. 16, 1910.

4 SHEETS SHEET 3.

lnverzi'of Wayne/350,3

J. HELLER.

PROCESS OF ROLLING-IN REGESSBS IN BLANKS.

APPLIUATION FILED MAR- 6, 1969.

Patented Aug". 16, 1910.

4 SHEETS-SHEET 4.

Inflenfor w v,

Wiilleflses TlNTTED STATES PATENT OFFICE. I

JULIUS HELLER, 0F VIENNA, AUSTRIA-HUNGARY, ASSIGNOR TO THE FIRM OF SCI-IRAUBEN-UND SCHMIEDEWARENFAIBRIKS AKTIENGESELLSCHAF'I' BREVILLIER 85 C0. UNI) A. URBAN 8a SGHNE, OF VIENNA, AUSTRIA-HUNGARY.

senses.

Specification-of Letters Patent.

Patented Aug. 16, 1910.

Application filed March 6, 1909. Serial No. 481,586.

To all whom it may concern:

Be it known that I, JULIUS HELLER, a subject of the Emperor of Austria-Hungary, residing at Vienna, Empire of Austria-Hungary, have invented certain new and useful Improvements in the Process of Rolling in Recesses in Blanks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to rolling processes and machines in which the treatment of the work is effected by means of tools which have the shape of a groove at the working surface. In this treatment however the material is forced or displaced from the points of the work treated and forms a kind of bur and the said displacement mostly alters in an undesirable manner the shape and the dimensions of the work treated, the material forced out by the tool indentations pressing against the other layers of material and forcing or displacing them beyond the original surface of the work.

According to this invention, the material constantly ressed out or displaced during the rolling beyond the desired limiting surface is cut away by means of one or more suitable cutting tools, so that no preliminary or subsequent treatment of the work is required, and in spite of that, the movement of -materialproduced by the displacement does not result in any change of the shape or dimensions of the work.

In the accompanying drawin s-Figure 1 shows the end of a. bolt blank. ig. 2 shows the same bolt, partly in section, with the threads cut thereon and projecting outwardly beyond the surface of the bolt. Fig. 3 shows the end of another form of a bolt blank with the end turned down when it is desired to cut a thread thereon of the same diameter as the main part of the bolt. Fig. i is a similar view, partly in section, showing the bolt blank with the thread out thereon. Fig. 5 is an end view, partly in section, showing a bolt blank and the jaws of the rolling mechanism in section, the bolt itself being also shown partially in section. F g. 6 is a similar sectional view taken at right angles to the section plane of Fig. 5. Fig.

7 is a top view in section, showing the action of the parts illustrated in Fig. 5, and also showing the means for cutting off the edges of the thread. Fig. 8 is a similar cross-sectional view of the parts shown in Fig. 6. Fig. 9 is a diagrammatic view showing the various stages of the rolling process. Fig. 10 shows, in side elevation, a part of the end of a boltblank with one of the dies and the knife not yet engaged therewith. Fig. 11 is an end view of the same. Fig. 12 showsthe blank as yet untouched. Fig. 13 is a view similar to Fig. 10, showing one of the dies as it beginsto cut the blank. Fig. 14 is a view similar to Fig. 11, showing one of the dies and the shearing knife in engagement with the blank. Fig. 15 is a side'view of one of the ends of the blank, showing the burs formed on the blank by the cutting die, and Fig. 16 shows one end of the blank with the cut completed.

The invention is speciall important for the cutting of screwthread y means of the well known screwthread cutting rolls, in which a flow or displacement of the bolt material takes place so that the outer edges of the screwthread project beyond the circumference of the bolt, or the outer diameter of the screwthread becomes larger than the diameter of the bolt. If, for instance, the bolt shown in Fig. l of the drawing, of a diameter a, were brought on. the rolling ma-- chine for cutting screwthread, it would get a screwthread with an outer diameter a m, as shown in Fig. 2. If it were therefore desired, to produce a screwthread, theouter diameter of which is equal to the diameter of the bolt, the portion of the bolt to be provided with the screwthread, would have to be first turned down to the extent a: as shown in Fig. 3,'whereupon the rolling machine for' cutting screwthread would produce the desired screw bolt shown in Fig. According to this invention, however, it 1s possible to cut'on the rolling machine a screw thread, the outer diameter of wh1ch 1s equal to the outer diameter of the bolt, without it being necessar first to turn down the por-' tion of the be t to be provided with screwthread. This is effected by a shaving being constantly out awa from the outer screwthread edge, the thickness of the said shawingcorresponding to the extent to which the screwthread made projects beyond the diameter of the bolt. To that end, between the two jaws of the rolling machine is arranged a cutter ad'ustable in a direction. parallel to the said aws, resting against the bolt to be rolled between the two jaws, and acting in the manner shown in Figs. 5 to 8. Of the said figures, F i s. 5 and 6 are two sec-. tions, at a right ang e to each other, through the axis of the bolt, while Figs. 7 and 8 show the corres onding plans. As will be seen, the cutter 1 has such a shape that at the same time it rounds ofi" the end of the bolt. Two such cutters of course could be provided, or separate cutters could be provided for the treatment of the end of the bolt, which would constantly cut away the material forced forward at the end of the bolt, keeping the desired rounding of the end of the bolt.

The single stages of the process are diagrammatically illustrated in Fig. 9. It is assumed in this case, it is a machine with a .movable jaw B and a fixed or stationary jaw B. At the begirming of the treatment, the cutter M has the position shown at I in Fig. 9. As soon as the bolt S has been brought by the movable jaw B to the cutter (II) the latter becomes operative and durlng further movement of the bolt goes back with it. Shortly before the end of the rolling process,- an accelerated movement is iven to the cutter M, so that it moves away om the bolt S (III). In order to obtain a Whitworth .screwthread without an outer flattening, the position must be such that the cutter, during its action, should cut away a thicker shaving than would be necessary for keeping the proper diameter of the bolt,

. namely thicker to the extent to which, durp are illustrate ing the last rolling stage, after the removal of the cutter from the bolt, the outer screwthread edge is forced outward. As ,will be seen at IV the cutter goes back to such an extent that the finished bolt. can freely leave the jaw. In that way, a perfect Whitworth screwthread is obtained, the outer diameter of which is exactly equal to the diameter of the bolt.

' For morefully explaining the improved process in F1 10 varlous stages of the same on an exaggerated scale, the example selected for illustration urposes .bemg the manufacture by rollin o a screw In which the outer diameter 0 the thread has to be exactly the same as that of the shank.

Fig. 10 shows in end elevation, Fig. 11 in side elevation the position of the cylindrical screw blank and the u per or movable rolling die B at the beginning of rolling. In this stage of the process the die B is out of contact with the screw blank and so is also the'knife M; therefore the lengthwise contour of the blank shown in Fig. 12 has in this stage of the process not yet undergone any change. After the die B has moved lengthwise through a certain distance the ribs of the same have penetrated into the metal of the blank as shown in end elevation in Fig. 13 and in side elevation in Fig. 14

with the result that the metal of the blank is forced outward between such ribs and the lengthwise contour of the blank shows the configuration shown in Fi 15, in which 1, 1 indicate the burs forme on the blank at the sides of the ribs of the die B entered into the metal of the blank. At the same time the knife Mhas so far a roached the blank that it cuts off the said urs leaving the outer diameter of the thread, the same as that-of the shank as shown in Fig. 16. As the movement of the die B continues its ribs penetrate more deeply into the material of the blank whereby fresh material is forced outward forming burs 2 as indicated in Figs. 17, 18 and 19 showing views similar to Figs. 13, 14 and 15 respectively. The knife M, however, still more a proaches the ig. 18 so that it not only cuts ofi the burs 2 whereby the outer diameter of the thread is reduced as compared with that of the shank of the blank as. seen from Fig. 19 in which the full line shows the configuration of the lengthwise contour of the blank imparted to it by the die B and the dotted line indicates the configuration of this contour after the knife M has made its cut. Therefore as the die B approaches the end of its stroke the part of the blank on which the screw thread is being produced is of a smaller diameter than the shank of the blank as is shown in dotted lines in Fig. 20 which is an end elevation corresponding to Fig. 13. The IlbS of the die fully penetrating into the blank force out the metal of the same so that it completely fills the grooves'between the said ribs, the distance. of the bottoms of such grooves from the axis of the blank bein exactly equal to the radius of the sha as indicated in full lines in Fig. 20 and Fig. 21 (corresponding to Fig. 14). In this last stage of the movement of the die the knife M has receded from the blank as seen from Fig. 1 and thus leaves the thread produced by the dies unaltered as seen from Fig. 22. The screw thread on the bolt is thus finished, its outer diameter bein exactly equal to the outer diameter 0 the shank and the screw is ready for use.

I claim A process for producing circumferential recesses in bodies of revolution, such recesses having a predetermined de th relatively to the outer surface of the ho y of revolution consistin in rollin such blanks between dies and uring rolIing first cutting away the material forced out under the action of the dies beyond a predetermined and the depth of the recesses attains the prelimit and in addition thereto a part of the determined value. 10 material within such limits and then inter- In testimony whereof, I afiix my signature, rupting such cutting but continuing rolling in presence of two witnesses. whereby the material forced out in the latter JULIUS HELLER. stage of rolling is forced into the place of Witnesses:

the material cut oil within such limit in ARTHUR BAUMANN,

the previous stages of rolling and cutting ROBERT W. HEINGARTNER. 

